Question

//RootViewViewController.h

#import <UIKit/UIKit.h>
#import "SettingsViewController.h"
#import "OneSlotViewController.h"
#import "TwoSlotViewController.h"
#import "BingoSlotViewController.h"
#import "SettingsViewController.h"

@interface RootViewViewController : UIViewController{

    IBOutlet UIButton *owaru;
    OneSlotViewController *oneSlotViewController;
    TwoSlotViewController *button2ViewController;
    BingoSlotViewController *button3ViewController;
    UIViewController *pushedController;
    UIButton *hajimekara;
    SettingsViewController *settingsVc;


}
@property (retain, nonatomic) UIButton *hajimekara;
@property (strong, nonatomic) IBOutlet UIButton *owaru;
@property (nonatomic, retain) OneSlotViewController *button1ViewController;
@property (nonatomic, retain) TwoSlotViewController *button2ViewController;
@property (nonatomic, retain) BingoSlotViewController *button3ViewController;
@property (nonatomic, retain) UIViewController *pushedController;
@property (nonatomic, retain) SettingsViewController *settingsVc;

//RootViewViewController.m

@synthesize button1ViewController;
@synthesize button2ViewController;
@synthesize button3ViewController;
@synthesize pushedController;
@synthesize settingsVc;


-(IBAction) startButtonPressed:(id) sender { 
    if (self.settingsVc.pushedController!=nil) { 
        NSLog(@"push"); 
        [self presentViewController:self.settingsVc.pushedController animated:YES completion:NULL]; 
    } 
}

//SettingViewController.h

#import "OneSlotViewController.h"
#import "TwoSlotViewController.h"
#import "BingoSlotViewController.h"

#import "SettingsViewController.h"

#import "AGImagePickerController.h"


@class RootViewViewController;


@interface SettingsViewController : UIViewController<UINavigationControllerDelegate, UIImagePickerControllerDelegate, UIPopoverControllerDelegate,UIScrollViewDelegate>{


    OneSlotViewController *oneSlotViewController;
    TwoSlotViewController *button2ViewController;
    BingoSlotViewController *button3ViewController;
    UIViewController *pushedController;
     RootViewViewController *mainVc;
    UIImageView *lastPriceView;
    CustomImagePicker *_imagePicker;
    UINavigationController *navController;

}


@property (nonatomic, retain) UIPopoverController *popoverController;
@property (nonatomic, retain) OneSlotViewController *button1ViewController;
@property (nonatomic, retain) TwoSlotViewController *button2ViewController;
@property (nonatomic, retain) BingoSlotViewController *button3ViewController;
@property (nonatomic, retain) UIViewController *pushedController;
@property (nonatomic, retain) RootViewViewController *mainVc;
@property (strong, nonatomic) IBOutlet UIImageView *lastPriceView;
@property (nonatomic, retain) CustomImagePicker *imagePicker;
@property (nonatomic, retain) IBOutlet UINavigationController *navController;

//SettingViewController.m

-(IBAction) button1Pressed:(id)sender {
    if (self.button1ViewController==nil) {
        button1ViewController = [[OneSlotViewController alloc] init];
    }
    self.pushedController = button1ViewController;
}

-(IBAction) button2Pressed:(id)sender {
    if (self.button2ViewController==nil) {
        button2ViewController = [[TwoSlotViewController alloc] init];
    }
    self.pushedController = button2ViewController;
}

-(IBAction) button3Pressed:(id)sender {
    if (self.button3ViewController==nil) {
        button3ViewController = [[BingoSlotViewController alloc] init];
    }
    self.pushedController = button3ViewController;
}

I have already declare there instances un the two controllers.
Whenever a button is pressed in the SettingsViewController it will pass the ViewController to the MainViewController’s startButton.
But I cant seem to make it work. Thanks for your help.

Answer 1

SettingsViewController.pushedController and MainViewController.pushedController are separate variables. Changing one will not effect the other.

You have two options. You either need to store the SettingsViewController in the MainViewController, or pass the MainViewController to SettingsViewController.

If MainViewController keeps a reference to the SettingsViewController, then you can:

-(IBAction) startButtonPressed:(id) sender { 
    if (self.settingsViewController.pushedController!=nil) { 
        NSLog(@"push"); 
        [self presentViewController:self.settingsViewController.pushedController animated:YES completion:NULL]; 
    } 
}

If SettingsViewController is passed a reference to MainViewController, then you can:

-(IBAction) button1Pressed:(id)sender {
    if (self.button1ViewController==nil) {
        button1ViewController = [[ViewOneController alloc] init];
    }
    self.mainViewController.pushedController = button1ViewController;
}

-(IBAction) button2Pressed:(id)sender {
    if (self.button2ViewController==nil) {
        button2ViewController = [[ViewTwoController alloc] init];
    }
    self.mainViewController.pushedController = button2ViewController;
}

-(IBAction) button3Pressed:(id)sender {
    if (self.button3ViewController==nil) {
        button3ViewController = [[ViewThreeController alloc] init];
    }
    self.mainViewController.pushedController = button3ViewController;
}

Pick one of these things and you should be OK.